Cooled turbomachinery components
First Claim
1. A film-cooled component having wall means comprising a first surface subject to heating by flow of hot fluid therepast and a second surface subjected to cooling by flow of pressurized coolant therepast, the first surface having a plurality of small coolant exit apertures therein connected to the second surface by cooling hole structures extending through the wall means, whereby coolant exits from said apertures onto the first surface for film-cooling of the same, each cooling hole structure comprising in flow series a plurality of coolant entry apertures in said second surface, a flow constriction and one of said exit apertures connected only to said one flow constriction, each cooling hole structure being a plurality of substantially straight mutually intersecting holes which share said flow constriction and said exit aperture, each cooling hole structure being separated by a portion of said wall means from each other cooling hole structure so that said cooling hole structures are unconnected to one another, said flow constriction comprising the intersection of said holes and said exit aperture being formed adjacent said intersection, said flow constriction being of smaller flow are than said exit aperture.
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Accused Products
Abstract
An aerofoil for a gas turbine engine turbine rotor blade or stator vane is subject to film cooling by multiple rows of small cooling air exit apertures in the exterior surface of the blade or vane. Each exit aperture is supplied with cooling air through at least two holes extending from the aperture through the wall of the blade or vane to interior chambers or passages. The holes are mutually intersecting and their intersection forms the exit apertures and defines a flow constriction for controlling the flow rate of cooling air through the holes and out of the aperture. If the holes'"'"' centerlines intersect behind the plane of the exterior surface by an optional distance, the flow constriction is spaced apart from the exit aperture and is within the wall thickness, the exit aperture being enlarged. These film cooling hole configurations reduce the liability of the holes to block up due to contamination by environmental debris.
151 Citations
13 Claims
- 1. A film-cooled component having wall means comprising a first surface subject to heating by flow of hot fluid therepast and a second surface subjected to cooling by flow of pressurized coolant therepast, the first surface having a plurality of small coolant exit apertures therein connected to the second surface by cooling hole structures extending through the wall means, whereby coolant exits from said apertures onto the first surface for film-cooling of the same, each cooling hole structure comprising in flow series a plurality of coolant entry apertures in said second surface, a flow constriction and one of said exit apertures connected only to said one flow constriction, each cooling hole structure being a plurality of substantially straight mutually intersecting holes which share said flow constriction and said exit aperture, each cooling hole structure being separated by a portion of said wall means from each other cooling hole structure so that said cooling hole structures are unconnected to one another, said flow constriction comprising the intersection of said holes and said exit aperture being formed adjacent said intersection, said flow constriction being of smaller flow are than said exit aperture.
- 10. A method for producing a film-cooled component, the component having wall means comprising a first surface subject to heating by flow of hot fluid therepast and a second surface subject to cooling by flow of pressurized coolant therepast, the method comprising drilling a plurality of groups of film-cooling holes through the wall means to connect the first surface to the second surface, the members of each group of holes being drilled sequentially with different but crossing orientation with respect to each other such that they penetrate the first surface in overlapping fashion to form a common coolant exit aperture and intersect each other to form a flow constriction for controlling the flow rate of coolant out of the common exit aperture, said flow constriction being of smaller flow area than said exit aperture, and including the step of maintaining the members of each group having a common coolant exit aperture separated from the members of each other group associated with a different exit aperture.
Specification